US5655751A - Oil drain device for valve spool cap - Google Patents

Oil drain device for valve spool cap Download PDF

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Publication number
US5655751A
US5655751A US08/497,345 US49734595A US5655751A US 5655751 A US5655751 A US 5655751A US 49734595 A US49734595 A US 49734595A US 5655751 A US5655751 A US 5655751A
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US
United States
Prior art keywords
spool
valve
drain
valve body
spool cap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/497,345
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English (en)
Inventor
Hyung Joon Cho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Construction Equipment Korea Co Ltd
Original Assignee
Samsung Heavy Industries Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1019940024708A external-priority patent/KR960011161A/ko
Application filed by Samsung Heavy Industries Co Ltd filed Critical Samsung Heavy Industries Co Ltd
Assigned to SAMSUNG HEAVY INDUSTRIES CO., LTD. reassignment SAMSUNG HEAVY INDUSTRIES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHO, HYUNG JOON
Application granted granted Critical
Publication of US5655751A publication Critical patent/US5655751A/en
Assigned to VOLVO CONSTRUCTION EQUIPMENT KOREA CO., LTD. reassignment VOLVO CONSTRUCTION EQUIPMENT KOREA CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAMSUNG HEAVY INDUSTRIES CO., LTD.
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor

Definitions

  • the present invention relates in general to devices for draining oil out of a valve spool cap and, more particularly, to a structural improvement in such devices for rapidly draining the oil out of the valve spool cap and thereby improving responsibility of the valve spool.
  • the valve includes a spool cap 103 for receiving an end of a valve spool 102 extending to the outside of a valve body 101.
  • the valve spool 102 is biased by a spring 104 at a given spring force.
  • the spool cap 103 is filled with oil.
  • the oil in chamber “A" of the spool cap 103 should be rapidly drained.
  • the device for draining the oil in the valve is formed by a gap which is selectively defined between the interior end wall of the cap 103 and a spring guide 105 when applying pilot pressure to the spring guide 105.
  • the oil in chamber A is drained to a drain tank (not shown) through the gap and through a drain line B.
  • the above oil drain device has a problem that the desired rapid responsibility of the spool 102 in response to the pilot pressure can not be achieved due to both the weight of the spool 102 and the negative pressure in the line B. That is, the above oil drain device can not achieve rapid oil draining even though the oil should be rapidly drained out of the spool cap 103 in order for improving the responsibility of the spool 102.
  • the typical valve needs relatively large pilot pressure in order to move the spool.
  • each of the prior art valves include a groove 203 which is formed on a spool 202 to form a given gap between the exterior wall of the spool 202 and the interior wall of a valve body 201.
  • the drain core 204 for directly draining the oil to the drain tank is formed in the valve body 201 such that the drain core 204 is opposed to the groove 203.
  • each of the prior art valves has a problem that each valve has a time delay in oil draining due to the fact that the intended drain function is not activated until the spool 202 moves by at least the distance "1" by shifting the portion of groove 203 into the spool cap 206 and thereby making the inside of the spool cap 206 communicate with the drain core 204 of the body 201. Due to the time delay, the prior art valves can not achieve the desired responsibility of the spools.
  • an object of the present invention to provide a device for draining oil out of a valve spool cap in which the above problems can be overcome and which makes the oil start to drain out of the spool cap just after the valve spool starts moving and thereby remarkably improves the responsibility of the spool.
  • the invention provides a device for draining oil out of a valve spool cap comprising a drain core formed in a valve body for rapidly draining the oil out of the spool cap, wherein the valve body includes: an enlarged inner diameter portion formed by partially enlarging the inner diameter of a bore of the valve body in a region between the drain core and an end wall of the valve body opposed to the spool cap such that a gap is defined between the interior wall of the bore and the exterior wall of a valve spool received in the bore, the gap making the inside of the spool cap communicate with the drain core Just after the spool starts moving.
  • the invention provides a device for draining oil out of a valve spool cap comprising a drain core formed in a valve body for rapidly draining the oil out of the spool cap, wherein the valve body includes: a drain hole extending in the valve body from the drain core to an end wall of the valve body opposed to the spool cap and thereby making the drain core communicate with the inside of the spool cap and making the oil drain out of the spool cap into the drain core through the drain hole just after the spool starts moving.
  • FIG. 1 is a sectional view of a typical valve
  • FIG. 2A is a sectional view of a typical valve with a so-called “drain core";
  • FIG. 2B is a sectional view of the valve of FIG. 2A, showing oil draining out of valve spool cap through the drain core;
  • FIG. 3A is a sectional view of a valve with an oil drain device in accordance with a primary embodiment of the invention.
  • FIG. 3B is a sectional view of the valve of FIG. 3A, showing oil flowing out of a spool cap into a drain core through a gap defined between a spring guide and an end wall of valve body and through a gap defined between the interior wall of a bore and the exterior wall of a valve spool;
  • FIG. 4A is a sectional view of a valve with an oil drain device in accordance with a second embodiment of the invention.
  • FIG. 4B is a sectional view of the valve of FIG. 4A, showing oil flowing out of the spool cap into a drain core through a gap defined between a spring guide and an end wall of a valve body and through a drain hole extending in the valve body from the drain core to the end wall of the valve body.
  • valve the general structure of the valve, interior structure of the valve spool cap and drain core structure are common with those of the prior art valves shown in FIGS. 1, 2A and 2B and further explanation for the elements common to both the valve of this invention and the prior art valves is thus deemed unnecessary.
  • FIG. 3A is a sectional view of a valve provided with an oil drain device in accordance with a primary embodiment of the invention.
  • a gap "t" is defined between the interior wall of a bore 4 and the exterior wall of a valve spool 5 by forming an enlarged inner diameter portion in a valve body 1.
  • the enlarged inner diameter portion is formed by partially enlarging the inner diameter of the bore 4 to be bigger than the outer diameter of the spool 5 within the region between a drain core 2 and an end wall of the valve body 1 opposed to a spool cap 3.
  • first slope surface s1 of an inclination angle in the end wall of the valve body 1 and to form a second slope surface s2, having an inclination angle equal to the inclination angle of the first slope surface s1, in an opposed end of a spring guide 6 contacting with the first slope surface s1.
  • the interior of the spool cap 3 can communicate with the drain core 2 just after the spool 5 starts to move in the direction of arrow "a” as shown in FIG. 3B.
  • the movement of spool 5 in the direction of arrow "a” is accompanied with movement of the spring guide 6 in the direction of arrow "a” so that the gap between the slope surface s1 of the body 1 and the slope surface s2 of the spring guide 6 is enlarged.
  • the oil in the spool cap 3 flows into the drain core 2 through the gap between the slope surfaces s1 and s2 and through the gap "t" between the interior wall of the bore 4 and the exterior wall of the spool 5 and in turn is drained to a drain tank (not shown).
  • a drain tank not shown.
  • the oil flows more smoothly out of the spool cap 3 into the drain core 2 due to the presence of slope surfaces s1 and s2.
  • FIG. 4A shows a valve with an oil drain device in accordance with a second embodiment of the invention.
  • the oil drain device of this embodiment includes a drain hole 14 which extends in a valve body 11 from a drain core 12 to an end wall of the body 11 opposed to a spool cap 13.
  • the drain hole 14 thus makes the drain core 12 communicate with the inside of the spool cap 13.
  • the oil in the spool cap 13 flows into the drain core 12 through the drain hole 14 just after the spool 15 starts to move.
  • the oil in turn is drained to a drain tank (not shown).
  • the movement of spool 15 in the direction of arrow "a” is accompanied with movement of spring guide 16 in the direction of arrow "a” so that a gap is formed between the end wall of the body 11 and the opposed surface of the spring guide 16 and gradually enlarged.
  • the oil in the spool cap 13 thus flows into the drain hole 14 through the enlarged gap between the valve body 11 and the spring guide 16 and in turn is drained to the drain tank (not shown).
  • the invention provides a device for draining oil out of valve spool cap which makes the oil start to drain out of the spool cap just after the valve spool starts moving and thereby remarkably improving the responsibility of the spool. Apparatus having the valve with the instant oil drain device will thus achieve precise and rapid operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Lift Valve (AREA)
  • Details Of Valves (AREA)
US08/497,345 1994-09-29 1995-06-30 Oil drain device for valve spool cap Expired - Fee Related US5655751A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1019940024708A KR960011161A (ko) 1994-09-29 1994-09-29 밸브의 스풀캡 오일 드레인장치
KR94-24710 1994-09-29
KR94-24708 1994-09-29
KR19940024710 1994-09-29

Publications (1)

Publication Number Publication Date
US5655751A true US5655751A (en) 1997-08-12

Family

ID=26630588

Family Applications (1)

Application Number Title Priority Date Filing Date
US08/497,345 Expired - Fee Related US5655751A (en) 1994-09-29 1995-06-30 Oil drain device for valve spool cap

Country Status (4)

Country Link
US (1) US5655751A (de)
EP (1) EP0708253A1 (de)
JP (1) JPH08105574A (de)
CN (1) CN1120643A (de)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255404A (en) * 1940-11-30 1941-09-09 Oil Well Mfg Corp Slush pump valve
US4610424A (en) * 1983-11-24 1986-09-09 Bochumer Eisenhuette Heintzmann Gmbh & Co Kg Shut-off valve

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1472167A (fr) * 1966-01-13 1967-03-10 Renault Perfectionnements aux distributeurs hydrauliques pour matériels agricoles
US4024798A (en) * 1975-05-01 1977-05-24 Caterpillar Tractor Co. Control valve providing two speed operation for a motor
US4247340A (en) 1978-09-19 1981-01-27 Rohm And Haas Company Purification of sugars using emulsion anion exchange resins
JPS5547313A (en) 1978-09-27 1980-04-03 Nippon Kokan Kk <Nkk> Manufacturing and supplying apparatus for oxygen gas
JPS5963377A (ja) 1983-08-31 1984-04-11 Hitachi Ltd 立軸ポンプの吸込水槽
FR2593265B1 (fr) * 1986-01-17 1988-04-22 Rexroth Sigma Distributeur de fluide hydraulique sous pression
US5394903A (en) * 1990-03-05 1995-03-07 Komatsu Zenoah Kabushiki Kaisha Hydraulic control valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2255404A (en) * 1940-11-30 1941-09-09 Oil Well Mfg Corp Slush pump valve
US4610424A (en) * 1983-11-24 1986-09-09 Bochumer Eisenhuette Heintzmann Gmbh & Co Kg Shut-off valve

Also Published As

Publication number Publication date
EP0708253A1 (de) 1996-04-24
CN1120643A (zh) 1996-04-17
JPH08105574A (ja) 1996-04-23

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AS Assignment

Owner name: SAMSUNG HEAVY INDUSTRIES CO., LTD., KOREA, REPUBLI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHO, HYUNG JOON;REEL/FRAME:007582/0769

Effective date: 19950624

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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

AS Assignment

Owner name: VOLVO CONSTRUCTION EQUIPMENT KOREA CO., LTD., KORE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG HEAVY INDUSTRIES CO., LTD.;REEL/FRAME:009561/0648

Effective date: 19981017

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20050812